$60 may be a little bit of a sticker shock for some people, I guess. But IIRC, there was an early access discount where it was only forty-something. Plus there are sales. Plus you're getting 2 different air frames with (slightly) different external models, quite different cockpits, and different performances. Plus they will both be multiplayer capable.
Regarding the multiplayer training aspect, one suggestion could be that the trainee would pay a small fee for access to the back seat in multiplayer only. $10? Then, if they decide to buy the module, they get a discount. Maybe this is getting convoluted a bit but this is a hypothetical discussion anyways.