Happens with a fairly often. Players quit....a Cyclones player, Theo Ruth, retired at 24 years old a few weeks ago. I've seen players quit who had NHL deals which were paying them well over $100,000 per season. ECHL players often leave to play in Europe as well.
Todd Robinson, one of the all time leading minor league scorers, quit Evansville of the ECHL last season to join the CHL Allen Americans where he won a CHL Championship.
Many ECHL players make roughly $500 per week plus housing. A lot of guys quit for better paying jobs every year.
Ruth couldn't stick in Milwaukee. He had no chance at the NHL. I wish him well in whatever profession he tries next. It is better than being a 28 year old NHL rookie.