I'll also note that there's an error (at least with my DL live set) which you sort of want to be aware of, as well as ANOTHER not so well known bug (Mostly cause to test it, you'd need to be willing to spend enough p-drops in one shot)
1. Although P-drops WILL boost the likelyhood a gold present will show up, it's not in fact 100%
At max producer rank (rank 20) you're allowed to use 200 p-drops at once.
Yes, I know someone who dropped enough money (About 17k worth) onto the single event. It refused to drop any gold presents. Needless to say, he quit, flat out.
2. The DL lives themselves do NOT use the normal 'present drop system'
I can confirm that I received a DL live present on a SILVER present drop, and further to the point, I also did the 2nd DL live, got a gold present and got an E costume out of it. Both I might add should be impossible according to what the game tells you.
Call it bad luck or whatever, but do that to enough people (namely lie to them, even if it could be a bug) and you'll lose the goodwill of a LOT of people, even if happens at a rate of 1 in 1000 or so.