This.
Also, I might handle it.....creatively. Things like storytelling, world background and internal plot logic are significantly more important than rules lawyering in my game. I probably wouldn't want to game with someone who would attempt this in the first place. But if one of my players ever did try something like this, the outcome would be in keeping with the storyline no matter what the book rules might say.
I might let this apparently work for awhile, if the idea of practice drills with summoned monsters appealed to them. Why not? If it made logical sense that they actually would learn something by summoning and examining a creature they had never seen before, fine. But it wouldn't take long before they wouldn't be able to learn anything new that way. And at some point, the piper would have to be paid.
"Those gateways that rip through the very fabric of the planes are fraught with peril, especially for the less experienced Seekers of the Ways. There are balances that must be kept, bargains that must be made, and currents that run unseen through the storm-tossed aether. Young wizards who use these tools crudely for mere profit, without a deeper understanding of those balances - they risk more than they know. Much more."
- Ourmphorous the White, First Scholar of the College Arcane
I wonder who or what might end up unhappy about the repeated abuse of a summoning spell? Whatever it is, it won't be much fun for the PC's. My long-time players know me well enough that if a new player tried something like this, they would probably sit on his head until he promised not to go there.
Or they'd cheerfully go with it as a plotline, knowing full well that payback would be a witch. I am blessed with some very good roleplaying gamers who value storytelling and character development over "winning".
