Coin Software Source For Pricing Information

That sounds like something that YOU are going to have to invent or write.

Thank you for the responses, both of you.

Both are salient points that I have come to, as well. Value is definitely arbitrary, in terms of the source of where the data is gathered from. Not to single out any one example, but CoinManage has both proprietary valuations and ones that appear to be obtained from PCGS. For the former, the blurbs that I could find are the typical "compiled from various sources", which could be anything, really. The PCGS data is interesting, because that is one of the examples that I do not see any source of them making that data available for reuse/repackaging. Done legitimately, my assumption is that there is some sort of licensing agreement in place on the backend that allows LBS to include this information in their product.

Not that I am considering writing something to reinvent the wheel, but something like an established source could be interesting, in terms of providing feedback on valuations - although, definitely not indicative of actual resale value. Most of these applications, I imagine, are for people wanting to track a reasonable insurable value for their collections. That is where the feasibility of it all comes in. My understanding (and I have not done this yet) is that most insurance companies would want an actual appraisal done on a collection for replacement value, which is yet another potentially arbitrary valuation.

It does, at least, give me some things to think about. At times, I wish that I had a profession that did not have a tendency to want to cross over into my personal life. A fair number of my hobbies have applications that I have written for personal use, and I do not see that changing. In terms of the ideas that I have been kicking around, valuation is more of a "nice feature", as opposed to a requirement.

Again, thank you both. At least I do have some thinking to do when I have some downtime.

One more point. Please keep in mind that the selling price for any coin, even in a particular TPG at the same grade may often vary considerably.

I was just looking at a 1941-S Walking Liberty half on ebay, as an example, in MS-65. NGC or PCGS is all I look at. For that "same" coin the ranges in price went from $500 to $1000.

Same with past selling prices - a huge range.

The eye appeal is impossible to narrow down since each coin is individual and has had it's own individual trip to your hand.