Shadow - Dragon
The legendary lotto will not be occurring more often. The advisement that you shouldn't roll if you don't want the legendary is not anything new. When the lotto was made, we asked that as a courtesy, people not roll for legendaries if they didn't really want them, but upon seeing more and more people rolling for the legendary "just because" and completely disregarding that request, we edited the lotto once again, further stressing this courtesy and also adding a limit on competitive legendaries to dissuade people from doing it any more. Furthermore, we set it to happen every three months because legendaries are supposed to be rare, and so having a lotto every month or every other month would be too frequent of a giveaway. However we wanted to have a consistent opportunity for a random legendary to be given away as well, so every three months seemed like a fair number, considering that, as Lia said, we have, and will, occasionally hold events with legendaries as a prize on top of the lotto, and of course there's also shards to collect and achievements to work towards for a legend of choice as well, so there are many opportunities to get a legendary.
Secondly, yes, you can choose to give away or trade legendary summon items if you wish, though if you got them competitively, they would still count towards your 3 competitive legendaries regardless of whether you have them still or not.
However, that being said, no, it is not an excuse to try and get a summoning item that you don't want, to use as a bargaining chip to get a legendary that you do want. That's simply not okay. If you don't want the legendary, out of courtesy and respect for the other members of this guild, you should bow out of this lotto and allow those who actually want the legend to have a shot at getting it and using it.