First of all, as Ho, and many others probably know by now, I am a full splice fan. I love both veneered and non-veneered full splices...love 'em, love 'em, love 'em...maybe it's all that wood.
With regards to if it is important if the cuemaker made the blank himself...well, for me it is generally preferred...but not an absolute requirement, as long as I know this up front, and it is a superior quality blank from a named source.
I guess, for me, it seems extra special when a high quality blank was crafted by the cuemaker. This may be because I know that it involves much more time and work...(sweat and blood)...to make a high quality blank. While the trade-off is a longer build time, the up-side is that, very often, the possible wood combinations that are available can make it very, very much worth the wait.
I also like the that it allows the cuemaker to take advantage of their well-seasoned stock, and put together some exceptional pieces of the desired woods requested. Inlays are nice, but there is just something about the inherent beauty of wood that really thrills me.
Does it add to the value? I may not be the best one to answer this. When I find a cue that has exceptional woods in it, and plays like nothing I have ever experienced before, well...it's priceless!
That being said...I would have to guess that it would add to the value in some manner, simply because, very often, the initial cost was higher.
With that said...there are some cuemakers making full splice blanks that are flying under the radar, and other cuemakers taking advantage of this source to make some very fine cues. There are other cuemakers who are taking the time to hand-pick blanks from the more well-known sources, and producing some equally fine cues. I would not have a problem with either one of these types of cues, as long as the cuemaker were up front about their source.
I also think I am a bit of a masochist, because it is not as easy as one might think to find a cuemaker that actually does craft their own blanks. I know, I ask all the time; the list is pretty short.
So, those are my thoughts on the topic...would be interested to hear what others think as well.
Lisa