Better answered at the Sony Vegas forum or the Vegas forum at dvinfo.net.
If you are tired of paying for extra effects, you are using too many!

Of all of the add-ons, I am only tempted to buy one (I have 9Plus and LE 6.0) as it directly relates to a project (the curtain wipe for HFX 5 - the project is doing a "Broadway" themed show this year).