At that point, what value are they bringing you to justify 30% of your sales without taking on any of the risk?
You have to think long and hard about whether people are finding your names via the BP marketplace, advertising they're doing, etc - or if they're more likely to type in your domain and land there organically.
If you sell 3 names on BP, how many of them do you think will have found you via their marketplace, vs people that were looking for your name in particular? If it's more than 1, you should just use your own landers (or Dan, Efty, etc,) and get your own logos made for $5-$10.
I would be really curious to see how many sales on a marketplace like this originate from type-in traffic buying the name they landed on vs somebody landing on a different page then finding your domain through internal promotions.
Also, someone could land on your domain, be ready to buy it, then end up choosing a different name, so assume that's a wash.
I dunno man... my thoughts on these marketplaces have shifted a bit. Yes, you could end up getting a sale from traffic that somebody else brought to the site, but that goes both ways, and the price is pretty steep unless they're doing a TON of marketing to bring traffic to their marketplace outside. I've seen marketplaces cite their total traffic stats, but I imagine the high 90%'s of that is either other sellers, or end-users who just typed in someone else's domain.
I think what appeals to people is the hands-off, "Jesus take the wheel" approach like your name gets approved so you feel validated and like you're on the right track... But as
@karmaco said, you need to be able to evaluate your own names, too, and to do it based on more than feelings or intuition.
In my first ~yearish of being a bit more serious about domaining, I submitted around 10 names to a brandable marketplace, I think 9 were denied, and I think 8 out of those 9 went on to sell to end-users within the next year. Basically one of the only names, the ONLY names, from that group that didn't sell (and still hasn't), was the one that got manually approved. This isn't necessarily a flaw of the market, since they're looking for a certain type of name, but it's something to think about. It's also just an anecdote.
Having said all that, I bought a few dozen SH names within the past 4-5 months and just had my first sale for 3k. Not going to post about it since it's on a 2 year payment plan and I don't want someone to interfere, but I have no way of knowing if I would have still made that sale using a dan lander, or even just using a text file that said "email me to buy".