There's a Literal Army of RMT BOts Doing the MSQ

[KageTokage]

I would like to note you can only boost to level 70. You can't boost to 60 anymore and 50 was never possible.

You're actually seeing them grind up to 50, then farm the gear, which is even more concerning.

Will the game just straight not allow you to buy a job skip if you only have the base game then?

I've seen them doing the level 30ish MSQ stuff in Southern Thanalan at level 50 and fully decked out in Ironworks gear (Aside from one of their ring slots, which is typical of a skipped character), and I can't think of any other explanation for it because they have no means of farming poetics otherwise (To my knowledge) due to all of the level 50 dungeons being locked behind MSQ progression.