I get what you're saying, but people do that all the time with other attractions.... it's called the "chicken exit". People love to see the theming of rides, but the ride is too intense (like ToT) so they stand in line and bail at the last moment. That's different than an ADR at Oga's since it is not an attraction itself, but an ADR.
It's a bar/restaurant (actually described on the Disney site as a "Lounge", "Table Service" under "Dining"). It's not listed under "Attractions" like the Star Wars attractions; Star Tours, ROTR, MFSR, Launch Bay:
Attractions in HS list
As an original SW fan I agree, (yes, I am that old) and I appreciate people wanting to see it and reports of CM's allowing people to take a look, without an ADR, are encouraging. But even as a fan I never dreamed of making an ADR, going and not ordering anything. I tend to be literal and follow descriptions and rules so even thought it's not listed as an "attraction" I didn't assume to treat it as one. To each his/her own, as I've said many times in this thread.
There are a lot of other comparisons to similar restaurants with a "draw".... Like Raglan Road with the show, Biergarten with the show, Rose and Crown which recently went Prix Fixe for the fireworks view, character meals, Trader Sam's and other hard to get into or dining with a "show" places. Oga's is just that..... a restaurant/lounge by Disney's own definition with a "show" of atmosphere, theming and DJ Rex. People don't go into those other places mentioned without ordering something, at least none that I've ever seen.
Everyone is going around and around with their interpretations and definitions of Oga's, SWGE in general, what your admission ticket includes, fan interest, bar/lounge/ADR/etc. but it doesn't change how Disney itself defines Oga's and what their definition of an ADR is. When people were discussing BOG and the cupcake crowd it was all about how little people could order (a cupcake to share for a whole family) just to see the inside of the castle and the Beast. Now with Oga's it's not about "how little can I order" but "do I have to order anything?"
Everyone can and will make that decision for themselves, but let's not change definitions to suit our own situations and beliefs. And people did choose to make a dinner ADR for BOG and order a single cupcake for years before it was changed. People did make ADR's for R&C to have appetizers and sit for 2 hours to see the show before the prix fixe... It's not a matter of "can I get away with it?", but "how long until Disney changes things?" because people find ways around the current ADR system and Disney's bottom line is getting more money out of it's guests. And CM's are not confrontational or demanding, they will never say anything. Disney just analyzes data and makes changes quietly.
Honestly, I tend not to pay too much attention to people around me on vacation and don't really care what others think. The thread was a question about ordering anything with a highly coveted ADR and that's what the responses and discussion have been about. But somehow if you share your opinion or state facts and someone doesn't agree they bring up busy-bodies, morals, etc. I prefer to operate on facts.... an ADR is an "advance dining reservation", not a FP+.