My VPS Node has been running since the DDos war and my motivation is not forging rewards....my motivation is to keep Nxt running...period.
Sure - of course there are probably quite a few running nodes whose motivation is not forging - hard to know whether or not that is the majority (perhaps being able to work this out might help with the decision).
I am guessing that a reduction from 1 to 0.1 should at least provide a good way to "get an idea" how much a "further tenfold reduction" would affect the network.
But I think nearly no one is forging for the real benefit of forging. If you do maths you will see you take really low profit. As mentioned before real value is keeping Nxt running, and that's the first for all the people who owns Nxt.