What are the downsides to doing a fantasy football keeper league?

Several members of my fantasy football league want to do this starting next year. They are talking about 1 or 2 keepers. I'd rather not be apart of one for several reasons:

1. We have a few members that like to trade. Whether it's players or draft picks, only 1 or 2 people are afraid to make deals. I'm concerned that the ones afraid to make deals would increase. For example, Calvin Johnson, AP, as well as other "keepers" get traded for rather fair deals. My concern is that people will be afraid to trade these level of players and they now become hands off. This leads to...

2. No future trade deals. Right now we don't make deals for next year draft picks. In order to trade high level players, this may be the only remedy since the only real value of a keeper is another keeper (IMO). I really don't want that to happen because...

3. There's no guarantee that people will return the next year. We have a solid 8-10 people. The most we've had was 14 players, but most years it's been only 12 (we've been doing this for 11 years). Although turnover is rare, it does happen. What happens when these guys start to trade their keepers on the way out? The incoming replacement teams cupboard may be left bare. We have a few people that would do that (including myself).

4. The draft order is random every year. There is no reward for being the best team or the worst team. The draft the following year will once again be randomized. So the team with the 2 best keepers can, in theory, have the first pick of the draft, and if they plan correctly, multiple 1st rounders! Depending on how bitter I (or someone else) are towards the trade deadline, I could trade some decent players to a strong divisional opponent to guarantee that someone in my division wins so our division becomes the host city. We have family members in the same division and although one lives in my town, would love to go see his family member and has made questionable moves in the past with his family member.

OR

Am I just over thinking things and I'm just afraid of change? Or, am I missing something?