Can't speak for bluewine but I've been in those types (top tier/agency booked) of bands (many years in NYC) and gigs paying even remotely close to that were few and far in between.
Having said that, I'll move my arse to Chicago or Maryland in a heartbeat if there's a bass chair open for me! Realize I'm extremely sceptical and will do some researching and detective work in order to be convinced! It's just my nature.
You and Bluewine are cracking me up on this tangent. No offense. Be skeptical. Maybe there is just one guy doing this here. Glad it's me. Most of the people I work with are full time professional musicians. This is how some of us do it.
I'll save you some legwork. Here's one of the booking agencies I work under, Sam Hill Entertainment.
www.samhillbands.com
The main band I work with under this agency is The Mustangs out of DC. Mainly old school R&B/Funk/Rock mixed with newer stuff. I've also worked with the Storytellers, a band out of NY.I work with the sax player and trombonist often. I work regularly with a couple of other agency bands that book with other agencies like East Coast, which also cross books the Mustangs. And I sub with other groups. This week the Mustangs are double-booked again so we'll have one version in Keswick, VA and I got switched over to the DC gig. i also work with Blue Funk, which does lower dollare weddings (four piece plus a couple of vocals, $3k range).
You'll see booking price brackets on the Sam Hill website along with lots of videos and recordings of various bands. You'll see me with the Mustangs. Most wedding bands IMO are okay at best. It's not like you have to be amazing to pull in big dollars. Most of the videos will make you wonder who in the world would pay that much for that...? Guess what... people do pay for the whole package (as Boris mentioned), which includes competence all around: business, music, social, etc. Strangely enough a lot of musicians can't handle that.
And yes, the higher dollar ones may not be booked every week but if you do what I do, juggle a few of these you can stay busy. For example this month I have two Mustangs hits, one with Invitiation and one with Night Rhythms. That doesn't include two hits at the Half Note with Power Source and other club dates I do as necessary. And then there's church.
I avoid conflicts by letting everyone know my prioritization: because the church hit is the most consistent, they take first priority. I had the manager of what was my main band, the Mustangs, upset because I was already booked for NYE when she got the date in October. I explained to her that I had booked NYE at the church in April when I took the job. We're on the same page now. After the church, if you want me, make sure you book me well in advance... I might not be available.
And not bragging, I'm in demand because I know a ridiculous number of songs, can play them in any key and couple that with being a professional and band leaders love people they don't have to worry about. Zero drama. And I do the simple stuff like responding immediately to correspondences and learning new material well before the gig. You'd be surprised how many people screw that up.
So do the math. If you two are still skeptical, cool. I have a friend in Roanoke who gigs with one of the biggest wedding bands, they do Trump's NYE party every year on an island off the coast of Florida among other things. It's true, there is a fairly small group of people doing this... guess why?
And yeah, I play six string fretless on alot of my agency gigs.
And we only play covers so... this is what happened.

