i think the main issue is the camo, regardless of how good or not a particular paint scheme is, you're ultimately limiting your market to people who not only want a gun in that configuration, but who also like the specific paint job. unlike parts paint is a bugger to remove so people are less willing to take on a painted gun with the intention of then stripping the paint.
there's also the issue of it having work done to it, whilst the parts themselves may have some value (eg the aster is going to add value), there's always the risk with a modified gun especially when the work hasn't been done by a big name tech. some people who are tech savvy themselves might not care as they have the confidence of fixing any issues themselves, but folks that aren't so tech savvy may be wary in case they end up with a lemon.
it's also worth noting that different people will prioritise different parts and value them accordingly.
for example my personal tastes mean that the hicaps, sling, battery, foregrip and suppressor are all parts that will either end up unfielded in my parts box, or are something i'll have to sell on, so the sale really boils down to £190 for a raider, 3 midcaps and an aster as well as adding the cost of a new barrel to revert back to the stock length.
granted that will vary wildly depending on the particular person viewing the ad, for example someone who doesn't mind hicaps would see some value in a couple of extra mags, but it's still something to consider.