Just my 5 cent here , bioware probably knows that there are fewer lvl 50s in game and decides to get them play again .
what happen with more lvl 50s around ?? The general chat wiill be filled with "LFM BLAH BLAH operation , mission ... ETC ETC " , hence motivating lowbies to keep leveling so that they can experience high-end content .
So , more 50s for a month , more low-level players motivated to remain playing , and subscription number will also increased. WIN WIN for bioware.
Maxed level characters is like cool kids , they bring the parties to them.