Mobile marketing question

While im sure this question has been answered before i cant seem to find it. I was wondering with cpa companies paying for mobile installs and and other companies selling them couldn't i just buy the install for one price and sell them for another and keep the profit or am i missing something??

thankyou rikki i will look into your service but right now im interested in the process. I have been member of blackhatworld since 2011 and im not looking for a handout i have made alot
of money through the methods here defintely the best internet marketing source online. Im looking into creating my owns real soon i just want to understand the pros and cons
of paying for app install and completing cpa install offers with it ( CPI CAMPAIGN I THink its called) any help would be greatly appreciated t
thankyou in advance.

#ifyoudontgrindyoudon'tshine