This is plain ol' ridiculous. Tkachuk is worth well more than what the op is offering... he's one of the best young wingers in this game and all but untouchable from a CGY perspective, I'd imagine...
As for the McAvoy and Pasta counterproposals, they're good for a laugh (which I'd imagine is their intent). Pasta arguably has the most valuable contract in the league... and McAvoy is rightly one of the defensemen in the Norris discussion, so i think that any non-chuckle related offers are probably far and away not going to get a sniff from Bruins' fans.