I only consider something P2W if the person buying stuff gains an advantage that isn't obtainable through in game means. Private servers in the past utilized this and created "donor" gear for those that donated. You couldn't get this gear any other way outside of donating and it was more powerful than any other armor set. If someone wants to pay real money for a boost or some service that skips the grind, I don't consider that P2W in anyway shape or form. As long as the grind isn't absurdly long, like having to invest anywhere close to a part time job for months on end, then it's not P2W. In the end, no amount of money will give them an advantage that I can't obtain myself through grinding the good ol' fashion way.