footballers were found guilty of it too - Edgar Davids, Jaap Stam and some others I can't remember the names of.
But I'd guess simply for the joint relief and extra power they'd get.
an example of 5% increased power output may not mean a lot to us, but to a professional athlete it makes the difference between a bad result and a very good one.
the margins are fine for them and the extra acceleration they'd get from seemingly a small increase in power output is well worth it.
They wouldn't need a lot at all, for the amount of muscle and increased power output they'd need they wouldn't get the bloat and water retention from that level of dose.