Yes- A sailplane can be a good trainer. My first RC toy was a sailplane and it took a holy beating (self taught)... But it gave me the skill to step up to four channel model. I would still recommend some help if you get a 72" electric. (its cheaper in the long run) or just until you get a handle on landing and flying toward yourself...

If money is an issue download FMS and buy a PC gamepad and practice flying on the sim.. The sim does not come with very many gliders but I can e-mail you one that is similar to anything you buy from tower.... happy shopping...