Not enough to make it worth the hassle. Spend your money on food instead.
I'm guessing peoples here will make a clan as soon as someone hits Level 5. If not, y'all should. A fully funded meat tree (meaning 50K untouched in the clan kitty) nets all members 500 meat per rollover, and a calendar of loathing gives each member an extra turn per rollover.
Also, as soon as you can buy a store, do so. You'll never lose it (unless you choose to sell your store, for whatever reason), and it's much more beneficial then the flea market. Even selling stuff for the minimum will net you a tidy profit.
I've got close to 1.4 million meat myself, all legit (no bugmeat, which is why you'll see people with meat in the billions), and I'm saving up to get something fancy, which would otherwise require the donation of legitimate money. Either a Mr. A or some kind of fancy familiar, I'm not sure which. Mr. A's go for around 6 million, while a Dreidl is cheaper at only 4 million. I've got plenty o'time to figure it out.