you should make customised banners like win a Lamborghini click here to participate, that should get you lots of clicks. Furthermore you can promote their sports betting or win Rolex watches via WoFs, because I don’t expect them to change anything on the site now, but you can can make better click bait banners to attract referrals.
He shouldn't be responsible for paying something like that just to get customers for someone else's business. I mean sure he would make money but there is no guarantee that he would recoup his own investment in something like that, plus he needs to pay on top of that to get some customers there as well.
I would say that it is clear to me freebitco.in should have some more banner options aside from the decade old ones that they are offering. It would be a lot better if they could get like 50 different ones, considering at the very worst case it would take like 100 bucks per banner, that's like 5k, nothing to a huge place like this. Hell 50k is nothing for a place like this but I would understand not wanting to spend that much, so spending like 5k to 10k for a lot more brand new and to be frank better banners would be something they could totally do.