I think less experienced players don't understand the fun and power of silk road until they get clobbered a few times with it.
According to
markus stats, which only take into account the games from the top ~1% of players, Silk Road gets completely ignored 63% of the time, and on average, being the only player to gain it lowers your win rate to about 42% when corrected for skill.
Less objectively, eyeballing the Thunderdominion votes, there's a bunch of people I don't recognize (which nowadays doesn't automatically mean they're newbies) but also a bunch of people that I do recognize because they're top players, and it seems like most of the names I'm familiar with agreed with the overall consensus on Silk Road votes.