Truthfully, I can't speak to your experience, but my experiences with Glenn have always been exceptional.
A boutique shop like Glenn's requires the patron to be different then if he is in the GC, like you said you went after. A high end dealer has more tied up in inventory then GC has in three or four stores. A high end dealer will not have several models around so he can put one out for people to bang on and take a new one out of stock.
In a shop like Glenn's, or Bass NW, or Bass Central, etc., you need to be a more careful patron. You need to take off all your jewelry, your belt, and anything that can remotely damage or blemish the bass. You need to play it but not bang, hard slap or grind your pick into the bass.
It is that way in most high end shops. Everytime someone tries the bass there is the chance it can get some damage, lowering the price and making the bass harder to sell. iTruthfully, I once saw a guy in a high end shop in the city bend strings on a fretless and mark up the previously pristine fingerboard. The owner was absolutely right to yell at that guy, as he damaged a bass. Anyone buying a bass that is high end, in a shop and not a custom built bass knows you will have some slight scratching at times but you don't expect a fingerboard to be marred or there to be significant play indications.
You could have approached him when you were ready and he would have most certainly helped you.
The other thing to remember is that in a shop like Bass Specialties, if you have cash, you WILL get the best deal. I saw two Fender Roadworns that were already marked at a decent price, and had I had some cash, I could have gotten a great price, I know. A much better price then I would have gotten at GC.
Tom