Yeah i did the same thing with my VX9800, since i make it a habit of plugging my phone into the charger on a nightly basis, it doesnt seem to matter to me if it drains more battery power.
From my experience (i've had it set this way since Dec.) battery life does decrease, but not to a point where it will be annoying. I have at one point used my phone regularly for a weekend without charging it on this setting and did not encounter the phone having to shut itself off.
Cool thing is, though, that if you do need to stretch your battery for some reason, you can use this method in reverse to turn on the powersave option.
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