Sobre el eloboost:
I made a new account for obvious reasons, but I've been running an ELO boosting service since August 2013. Obviously I can't speak for every boosting service, but I'll answer some of the questions in the thread based on my own experiences.
Most reputable services on the better known sites pay the boosters 70-75%. As a booster, you would have to be kind of dumb to be doing jobs for less than that. We personally use the 25% to cover things like VPN subscriptions, advertising, and the occasional chargeback from customers.
Prices vary, but ROUGHLY you are looking at 10-15$ per division in Bronze, $20-30 in Silver, $30-45 in Gold, $45-60 in Plat, and $75+ in Diamond. This is just a rough idea, and generally the more established and accomplished the service the more they charge.
Riot stuff. Well, in the past 15 months we've done something like 1000 total boosts. Out of all that, we have had 4 customers get banned. All of the bans were 2 weeks + loss of rewards. Only the customer ever got banned, there is no risk whatsoever for the booster. This is with us using paid VPN for all jobs. They are obviously pretty quiet about the whole detection process, since if they made the info available we would try to work around it.
Boosting as a whole took a pretty big hit with the removal of LP clamping. People ordered a lot more when they would get stuck gaining 3-5 LP per win and felt like it was impossible to get anywhere.
Busiest part of the season is actually the beginning now. Last season it was the end for rewards which seems obvious, but with no more clamping we actually have the most business now at the start of a season. Many people don't want to deal with the stress/risk of doing their own placements and have us do it for them to ensure they don't end up with a bad start.
Motivation for buying it varies a lot and its not like I really know most of the time. Most common seems to be lack of time (IE work full time, have money but no time for grinding rank) or simply the whole ELO hell mentality. You would think people would realize that the problem is them when we log on their account and go up 5 divisions in 5 days, but somehow they still convince themselves that the teams are the problem.
For the most common boosts or whatever, thats gonna vary a lot depending on the service. For example, we charge more than a lot of people for Bronze/Silver stuff so we get very little of that. Our most common order by far is P1-D5. You can find low Plat players that will do low ELO boosts for basically free, for us using all Masters boosters we mainly get Plat/Diamond boosts since other services struggle with those.
Oh, as far as motivation for doing it. Once you get to Diamond 1 (now masters) many people don't really have incentive to keep grinding Solo Q. Unless you are trying to eventually get into LCS or something, it just makes a lot more sense to do some boosts and make money instead of spamming ranked on your own account.
I think I covered most of it, if you have other questions I'll try and answer them.