Following the comments - your situation is slightly different than a garden variety scam questions here.
You're providing services of personal nature to people you actually meet in person. The bitcoin part is a mere suggestion (which I'm not sure is a very good one), not a requirement or part of the service. You're being paid in checks, and you're asking what are the risks.
In your situation the main risk is abuse, but if the clients are giving you checks and are willing to leave paper trail I don't think that financial, or even physical, abuse is likely. If you're dealing with cash - I'd suggest being careful since you're exposing yourself to robberies and forged currency. With checks - if law enforcement reaches out to you, don't think twice and throw your clients under the bus, you're not doing anything wrong.
I do suggest to properly report your income and avoid any trouble due to tax evasion etc. You may want to consult an attorney familiar with situations such as yours. I'm sure there are some near by, you just need to reach out.
Original answer, less relevant to your situation:
Money laundering: you're buying either stolen bitcoins or with stolen funds. You're the patsy, since the trail ends with you. The seller laundered (either the bitcoins or the cash) through you.
Pump and dump: you're being asked to manipulate the market, likely with stolen funds. You're being used to generate market and drive the prices up. Again, you'll be the patsy when the law enforcement traces the money to you.
Advance fee scam: 2 weeks is nowhere near enough for checks to be detected as fraudulent. Customers are given 30-60 days after the statement (i.e.: up to 90 days from the transaction) to notify the bank of a fraudulent transaction. Then it takes a while for the bank to investigate and get to you and claw the money back. I'd say it could easily take months, but they will eventually claw the money back. In this case, you already spent it by purchasing bitcoin from the scammer.
Does this sound legit, if complex?
Ask yourself - what are these services that you're being paid $1500/bi-weekly for, and whether they actually are worth it. If not - then no, not legit. If yes - then why so complex? Either way it stinks.