If he keeps shooting like has has been, he's worth at least twice what he's making now.
Looking at Avery's shooting splits, the only major differences this year versus years previous is that he's taking substantially more three pointers (43% of his shot attempts versus 28% of his career attempts), and he's hitting a crazy percentage on threes (45% versus his career 37%). Another weird thing is that he's actually taking fewer corner threes this year, and on attempts from the corners he's actually shooting 29%.
Avery has actually been shooting slightly worse than last year on attempts inside (0-3 feet) and just inside the arc (16 to <3).
Elsewhere, his steal percentage is the highest since his rookie season, his assist percentage is back to where it was before KG and Pierce got traded away, his free throw rate is the same as his career average, and his TRB% is the lowest of his career.
All of this is to say:
Avery has done a good job adjusting his shot attempts so that substantially more of his shots come from outside. His shooting so far this year has been phenomenal overall, mostly due to a huge improvement from outside. All of that said, he isn't really doing much else that's different from what he's done before.
This gives reason to feel optimistic that his improvement this year should continue as long as his shot distribution continues in its current vein, but it may not be realistic to expect him to continue to shoot well over 40% from deep.