There are plenty BTC devs who got in very early and have tons of cash at hand. What they would want is not to sell BTS to get money, but rather to build up a large stake in BitShares.
Simple solution, offer them 3 Delegate positions at 100%
1# Delegate position, half goes to BTS, half to bitUSD. (No Vesting Period)
2# Delegate position, goes straight into BTS. (Locked for 6 months)
3# Delegate position, goes straight into BTS + shorting bitUSD. (6 months locked; then 12 month vesting period)
A) No Dilution for before 6 months.
B) Through #2 and #3 the person will end up with over 5 million BTS in 12 months.
C) Through #1 the person will see immediate results with 1000 bitUSD a month + whatever 100k BTS is worth.
Sounds like a pretty bad-ass deal to me. Only a badass dev would get such a deal, and of course only a badass dev would already have the accumulated capital to accept such a deal. Anyway, this is just an example to get the creative juices going, there are definitely many options here, if we define a target, I am sure we can think of a great deal that they will accept!