Are SNGs Still Profitable??? ...a question of competition

[Mr.November]

I haven't played online in a while but am getting scared of hearing things that people have gotten a lot better...now, in the SNG FAQ it posted some attainable ROIs...are these still attainable or possible??? Then at what levels can they be attained or not attained at???

$3.40s - 18%
$6s - 16%
$16s - 14%
$27s - 12%
$60s - 10%
$114s - 8%
$225s - 6%
$335s+ - 4%