Unfortunately, I think you are correct.
Skinner's value is hard to gauge.
I don't think it's that hard to gauge. He's basically valued at a 1 year rental. If people are expecting a return as if he was signed for 4 years, then sure, they are going to be disappointed. At the deadline, Skinner's value is likely a late 1st and a decent (but not great) prospect. His value might be a little better than that right now, but also could be a little less. Here's why:
At the deadline, there are 16-20 teams that are in the playoffs/playoff hunt and by then, most of them know what they need to improve the team and at least 12 of them probably know their pick will be mid-late 1st round (non-lottery). So you probably have 10-15 teams that could use a guy like Skinner as a rental and might be asking for him.
That number could be significantly less today. Today, there are 17 teams that didn't make the playoff and have top 17 picks in the NHL. In addition, 6 first round picks from playoff teams have been traded to non-playoff teams: Ottawa (from Pitt), NYR (from Bos and TBL), Chi (from NSH), DET (from VGN), STL (from WPG). Most non-playoff teams are unlikely to want to trade for 1 year of Skinner so now the pool is maybe a half-dozen teams right now.