I have a few 3L.co's in my portfolio as well. The plan was to flip them soon as I purchased them, but slowly but surely I'm seeing the floor price rise for these. I'm noticing plenty of investors asking for BULK of .co's. Some of these investors are playing with deep pockets. I've seen investors with a budget ranging from $10K up to $100K asking for 3L .co' (preferably no vowels or V). With all 3L .co's being registered and can only be captured on the aftermarket, that alone drives the price up (Supply & Demand). Some investors are even willing to pay above floor price just to obtain them. Those kind of actions by investors lets me know that either:
A.) These investors know something that I don't and they're goal is to obtain many Premium or Semi-premium 3L .co they can at a low rate while they still can. hmmmmm
B.) The demand for 3L .co's is rising and they want to be first in line considering that .co's value compared to this time last year has gone up
IMO, I think the rise in the price or value is due to other 3L in the main extensions that are liked by Western's and Eastern's all being registered or traded for higher prices. Personally I think by the end of 2016 a lot of 3L, 3N, of any of the most liked extension will have a higher floor price that the previous year.
In other words, I'm holding mine until I think it's the right time to recoup my ROI (which I believe will be by the end of 2016, hopefully).
I've noticed that just like most stocks (If not all) everything is pure speculations until it happen (except .com)!