Welcome to the investing world of domain names ~
I'll give you a clear & conservative estimate on your names,
SpouseMate.com -
Value: $XX (low) - $XX (mid)
It just doesn't make a lot of sense, when have you heard someone say SpouseMate ?
Now that doesn't mean it's value is nothing, I think if built out like POF.com "plenty of fish" then you could have a serious money making business if you know how to advance and execute on a business model
CoinSteer.com -
Value: $XXX (mid)
This is a good start, it's a high brand-able and high keyword search under the term "coin" ... Develop a website based on network aggregating investors to VC and ICO firms, plenty of money to be made