As you level, you will buy new ranks of spells. If you splurge out on an item upgrade, you will not have enough gold readily available to upgrade to the latest ranks of spells: placing you behind. Moreover, you can buy gear upgrades from the Auction House (AH) or vendors. Furthermore, you may have large investments that need to be paid for professors. You will need to purchase reagents and items such as leather, bolts of cloth, alchemy supplies – unless you have a charitable friend or another high-level alt.
This is the lamest excuse to try and pin it on a cash grab. Tbh this is just you complaining to complain, there is no issue. If you wanted to play classic on launch you'd have to sub before hand anyways you're still paying month to month you don't pay by week. The only way you'd lose that money is if you quit before your sub ran out later on down the road.
Invest - If you do not plan to rush to level 60 and want to take your time instead, this tip might come in very handy for you. The value of many Items will increase over time because more and more Gold will find its way to the market. To take advantage of this, you can stack up on various crafting materials with the intention of selling them on a later date. This will require a lot of patience and some Grinding if you want to make a good profit but is certainly worth your while if you are an economy-oriented Player.
Legashi Satyrs (marked RED on the map) - Lageshi Satyrs, found in the northern Azshara are a great source of Runecloth, very valuable Felcloth (the main source of income from this spot), various Vendor Trash Items, and some Pocket Money. They can also be Pickpocketed, so Rogues will make additional Gold in this Spot. They have an annoying Mana Burn ability, so using an Interrupt is in order for all mana-based Classes. Satyrs also carry some Demonic Runes, that can be used to restore Mana at the cost of Health (basically, a Life Tap ability in the form of a Consumable. Those can't be sold on the Auction House, sadly, but are very useful nevertheless). Recommended Level - 50+ (52+ to be extra safe as Satyrs can be problematic because they tend to run away on low health and pull additional enemies).
Loot everything - Every single item in the game has some value and you should take advantage of this fact. Grey items can be vendored for that little bit of extra pocket money and white stackable items are needed for crafting, which means that people will generally buy them if you post them on AH for low enough price (if you can't be bothered to post Auctions, you can just vendor all of them and be done with it). Some of the looted items will rise in value over time, so you might also want to take your time and store them on Bank Alt.
I really can't buy into this reason because they used to do beta without the subscription requirement. It seems like if they want to test how many people are interested, they can just open it up to everyone like they do for every WoW expansion. And how are they going to know how many servers they need for all the people without a subscription who can't reserve a name or qualify for beta?
Whelgar's Excavation Site - This Dwarven excavation site was overrun by Raptors (Mottled Scythemaws and Mottled Razormaws). These reptiles are a great source of Medium Leather (you should have Skinning Profession if you want to farm here, as a very large portion of income that comes from this spot is acquired by Skinning Raptors). They also drop some Vendor Trash Items and Raptor Eggs (these are convenient, as a Cooking Recipe for them comes from a Quest that is located just above the Site) that can be used for Leveling up Cooking Skill. However, the best part about this spot is that both Raptor types present here drop level 19 Twink Gear (Feet of the Lynx, Sentry Cloak, Redbeard Crest, and Twisted Chanter's Staff) that will achieve astronomical prices at the later stages of the Game (drop rates are very low, so some RNG is involved, sadly). Recommended Level - 25+.