it dependsif you're the only bidder on those 30 or 200 it might be worth it... if there are a bunch of other bidders and you're planning to be bottom of the list, then it might not.
if you have the account anyway for other purposes, there's no harm in trying regardless (but you'll have to make a judgement about whether it would be worth opening an account just for these keywords if they are relatively rare)
don't forget there are lots of variations of keyword phrases
for example:
if some people search for X Y Z (where X, Y, Z are your keywords)
other people (perhaps fewer) might search for X, Y, Z, X Y, X Z, Y X, Y Z, Z X, Z Y, X Z Y, Y X Z, Y Z X, Z X Y, Z Y X, etc. etc.
It's a good idea to get all the relevant combinations - which allowing for word orders, and omitting words which may not be critical to the meaning of the phrase, can be a lot of combinations.
You may find our Pay Per Click Galaxy program helpful in generating all these combinations:http://www.marketingrocket.com/prodgalaxy.php
