SWTOR is getting an expansion very soon after just over a year of its first release. However this expac is just one planet, not a whole new area like other MMORPGs when they make expacs but that is probably why it will only cost $20 (or $10 if you're a sub). Seems more like an Xbox DLC regarding the amount of content but at least it's not $40-60 other MMORPGs charge.
Would this count as milking?