Austin,
Not sure who you spoke to but currently ATP instructors average about 75hrs a month. Additionally I made close to $20k/yr instructing for ATP 13yrs ago when the pay scale was half (and ATP currently has instructors making over $30 with incentives). Here’s a link to a thread Instructor Pay at ATP by Yarden (a recent grad/current Regional pilot) outlining the current pay scale and stating he averaged 100hrs/mos. At the current average of 75mos most instructors build their time in about 1.5yrs or less.
That all said ATP requires no contract and if you’re not happy or can do better you can of course leave at any time. I would keep in mind a primary reason many people train with ATP is the guaranteed instructor position. If the money and time building potential was so poor I doubt anyone would care or want to instruct for them.
Adam