You did very well with the price you paid. $145 for 15 paperweights is exceptional, especially since you didn't get stuck with any generic unsigned paperweights. I wouldn't trust eBay as the complete and final arbiter of value. Since you don't have any classic antique paperweights in the lot, or paperweights by some of the great contemporary artists, aftermarket value of your paperweights is very easy to discern in the United States. Value outside of the U.S. would be more difficult.
The American Robert Eickholt, of Ohio, was making paperweights as recently as this past May. He announced his retirement, and he has been winding down. His weights, especially his early weights, are everywhere and can sell for between $50 and $225 at antique shows, in antique malls, and at flea markets. It all depends on the style of the paperweight. Selkirk, from Scotland, is not an overly popular "brand" in the U.S. It has always been a second cousin to Perthshire and Caithness. Selkirk pieces go for between $50 and $125, again depending on the design.
Stuart Abelman, of Van Nuys, California, has been making glass for almost four decades, and he is still active. He has a large following, especially for his Christmas ornaments and clown sculptures (quite true regarding the latter). He doesn't make that many paperweights and his pricing has always been fair. His paperweights sold (and sell) new for between $95 and $145.
Glass Eye Studio (GES) of Seattle has issued thousands of paperweights, as noted above. Its new weights are in the $90 to $150 range depending on the store at which you buy one. Some of the early GES weights might go for a tiny bit more, but because there are so many of each design, aftermarket value rarely tops the retail price and is often much less. Prototypes are not in overwhelming demand.
GES and Stuart Abelman have their own websites.
If you attempt to sell any of the paperweights on eBay, value will be very flat for all of your paperweights, except perhaps the Abelman, and that depends on the design. There are just too many GES, Eickholts, and Selkirks in the U.S. for these paperweights to rock the marketplace. However, since you only paid an average of about $10 per paperweight, if you sell them on eBay, you will make a profit of at least 50% and certainly a little bit more. Condition is also important.
The good news is that you have a sweet instant collection of paperweights. Just spritz them with a glass cleaner, wipe them with a cotton cloth, and arrange them nicely. These paperweights will not make you rich, but they willl make you happy.