RE: Is the eosDAC airdrop a form of vote buying?
sure. Since I have 2 tokens (eosDAC and EOS), i want both of them to increase in value and have a better chance of doing so by voting for eosDAC. The DAC token could appreciate (%-wise) much more than the EOS token b/c the marketcap is so much smaller.
It benefits me much more, financially, by voting for eosDAC rather than voting for the BP that may be better positioned to increase the overall value of the EOS token price (better team, better tech, more experience, better location, etc) thus increasing the overall system's value.
Voting for a "normal" BP aligns the value to increase for all EOS holders, a vote for eosDAC skews this to potentially place the incentive to increase it's token value over the main EOS token.
tl;dr - voting for EOSNY may increase the value of the overall token (than voting for eosDAC), but voting for eosDAC could increase the value of my dac tokens moreso.
again, this is just theory and I have no proof that any of this will actually happen. Just looking at it from an economics and incentive perspective.