After 21 gigs (3 gigs * 7 laptops) he would've made around 21k USD (presuming he was making at least 10k rupees per night, which between 3k-30k would've made sense). Seems like at that point you just buy the darn laptop, it's not like you need something more than an Air for DJing, and 1/21th of your revenue to be legal seems like not a bad idea.