You may point to cover to win practices or pay to bypass clinics that are grind. In both instances people purchase those services to actually do the content, either to arrive in the cheap wow classic gold first place or to be in engaging in it workable. You purchase the op personalities to play , not to WoW Classic to play itself, you also buy the op weapons to perform together not to just own them and you definetly don't skip difficult grinds to not play what's at the very end of it but to get to the good parts. By definition buying raid runs is skipping content to do nothing, possibly you fork over enough to receive a few really excellent things, but also you as a casual will use them for nothing as you won't raid still without paying for it, you won't succeed in the unbalanced PvP without moving hardcore and world articles besides grinds for equipment worse than you paid for is almost non existant.
(In the modern game it makes far more sense, as achievments have direct value, buying a +10 guarantees a 410 item, higher equipment is much more applicable to casuals due to buy wow gold northdale casual material levels and pvp mounts present ).People can find their own pleasure in Classic as casuals(leveling dungeons, twinking, farming actual world updates slowly, attempting to perform wpvp in lower level zones) but paying for raid carries isn't fun, and doesn't lead to fun barring the most loot whoriest people.
This isn't MY opinion, but I dare you to find real vanilla players that paid to get a raid carry back in the day and found it fun(hint, you can just watch a movie of it, at least then the guy on your display is gonna be actually donating.) ?