Sammy Watkins is a 24 year old WR that was a thousand yard WR his first 2 years with poor QB play. It is concerning that he looked like the 3rd best WR on the rams this year, but that is why he is a buy target. His potential outweighs his cost, he should be dirt cheap.
Dirt cheap is a relative term
According to the guy who runs DLFs mock startup dynasty drafts, here is where Sammy falls in startups.
The third round of January’s '18 DLF dynasty ADP…
3.04 C Davis
Every league is different, every owner different, scoring - settings matter, Startups are different than existing leagues yada-yada ..........but this as close to a "market" measure value as I know
IMO Sammy isn't dirt cheap but probably appropriately priced or simply unavailable in most leagues. Most owners that still own him do so for the ceiling at this point. Unless you can pry him away with a piece of value the other owner needs or covets (rookie fever?) he isn't changing rosters.
In a Startup it takes a late third or an early 4th. I think its good risk - reward at that price personally but I also think that's about appropriate at this point without more information (FA). FWIW I also think he looked a lot better than you do this year, but he simply wasn't targeted as a secondary read by a QB he had no time to develop any chemistry. He was open continuously despite having one of the tougher CB schedule matchups going into the season.