Question about offers/recruiters/interviewing

I've been working w/ a recruiter who landed me a few interviews at some decent places, but nowhere that I particularly want to go. I mentioned to him that an internal recruiter from a BB had reached out to me and I was in process of applying/interviewing with them as well.

That BB made me an offer yesterday that amounted to a near 40% raise on my base. The separate external recruiter working on other roles at smaller places had told me early on -- in the managing expectations phase -- to expect somewhere around a 15% raise on my base.

I verbally accepted the offer from the BB and told the other recruiter so. He was obviously disappointed because it means he's losing potential commission from placing me somewhere, but he urged me to at least go on the interviews he has lined up and see what they have to offer.

I haven't committed to do so yet for two reasons:

1. I don't see any way these other places will come close to the BB offer.
2. I don't really want to work at any of these other places.
3. I am concerned that going on other interviews after verbally accepting an offer can potentially come back to the company that extended that offer and lead them to question my trustworthiness/commitment or even pull the offer.

I also know that a lot of recruiters can be extremely shady. What's to stop this recruiter from sabotaging me so I have to go with one of his clients?

I'm trying to manage this the best way possible by firstly, doing nothing to potentially harm my current offer which has been verbally accepted (and for which I'm told an official offer letter will be remitted Monday/Tuesday next week), and also not wasting anyone's time or burning other bridges.

I guess in typing this out the answer is pretty clear, reject the other interviews and just stay the course with this offer but I wanted to get some feedback from others on how they may have handled similar situations.

My biggest concern is recruiter sabotage. I don't know if that's a legitimate concern, but I've had friends who are recruiters and I've heard some really crazy stories about things they'll do.