technically you can change all of it. and be sure to challenge them on anything that sounds odd. like indemnification rights - who is responsible, do you put it all on your shoulders? the exclusive stuff is important.
it probably won't be $1000, especially if its a wholesale deal.
you also want to know how long you have to be with them, how easy it is to get out of it, what they expect of you in return (one guy wanted new work every month, a huge thing, for the next 3 years). how do they pay? i had one place say they only paid quarterly. it took a year before i was paid, and that's only because i threatened to give them a very bad review. do some searching for them online, make sure they aren't taking credit for someone else's work, i've seen that happen with a person i had. be sure you can still sell on your own.
one of the biggest issues i have is that they kind of own your work, and i know i mentioned it before but any deal you get - you will have to cut the profit in half with your agent or you'll breach the contract. when i dealt with an agent - first and last time - i only allowed her certain works. so if someone else wanted it, i didn't have to give it her, when she didn't earn it.
---Mike Savad
MikeSavad.com