If you do not play WCS I would just sell it. I had mine for a year and a half and enjoyed it a lot. but after I sold it I do not miss it at all. I just sold LOTR to get SW also. I don't miss that either even though it is one of the greats.
If you have kids or folks come over who like WCS keep it for them, but if it is mostly you and you don't play it then I would sell.
On Mono I kind of like it, but some friends warned me to stay away. I like fun quirky games and did buy RCT, a Lawlor from the same time frame as Mono and really liked it, but a POTC came up and RCT had to go to get it.
If you played and liked Mono grab it.