Mercing content has been done in every MMO since the dawn of... whenever the first MMO was.

Players aren't magically gifted the ability of a group to clear content then sell it, that takes time and effort. No, putting up a PF and hoping to get lucky with a clear isn't what they did. You must be proactive in meeting people and maybe even build a group yourself!

Also, the purpose of gil is to save time. Want a 4* item? Well you can either buy it off market, or you can painstakingly level every DoH/DoL to 50 and work your way up to be able to make the item which requires both raw stats from gear and practice and experience with how crafting works. Want a boss clear? Pay for it, or work on networking and building relationships with people who are capable of clearing content.

This isn't going to go away, ever. And it is not wrong in any way either. This is an MMO, social networking is part of the game and is required to clear content that has a time investment to learn.