We have just moved our boat from managed (formerly ABC, but we didn't want to transfer (back) to BCBM) to self managed. The day to day running of the job is shared between three of us. I'm currently planning the winter maintenance programme, which is using up a bit of time, but through the rest of the year, I doubt it takes me more than 30 mins work a week. Our secretary is doing the bookings for 2016 at the moment, which again, is taking up a bit of time and organising, but I suspect the rest of the year is generally similar to me.
We are looking at having the bathroom refitted/refreshed this winter, but provisionally our annual subs look to be under £1000 even allowing for the cost of the bathroom works. Losing the management fees out of the equation is saving us a fortune, and I do wonder why we didn't do it sooner!
I certainly would not rule out looking at a share in a self managed boat - just ask how much work (if any) you will be asked to contribute. It will certainly work out far cheaper than a syndicate run by a management company.