I have a site for my buy-side activity. I use Jessey Kwong 's REIConversion LandList site. It came with my purchase of the bundled LandList site and I highly recommend Jessey's products. It's hard to say which is better - their customer serine or their products - both are great.
Truthfully - I get almost zero activity on the site because I don't do anything to drive traffic there. I now send thousand of letters monthly, along with other approaches like cold calling in areas where I've seen high buy side demand, tax sale deed snatching, COSL / auction, referrals, prior sellers, etc. My letters have an e-mail and PatLive # (I don't even mention the buy-side site in my letters) and I am not doing nay SEO work.
But, I know others, like Seth Williams who have spent years build a reputation and have SEO working for them get leads that wat all them time - so I don't mean to say an inbound site isn't worth having. But, I don't think it is a must.
What I think it is much more valuable to first invest website time or $'S in:
A) a sell-side site where you can post your properties and all then information you know about it (that way when you the inevitable Facebook response of "Is this still available" &/or "Tell me more" - you can respond with "If it is still shown as for sale on our website at AbcSellsLand . com it is still available and the website has all the details we know about it. Please take a look and then let us know when you are ready to buy or have specific questions.
B) A company website that looks good and communicates as much about you and your company as you are comfortable with or you would want to see if if the show was on the other foot - you were going to decide to trust your company enough to engage in business transaction to buy or sell land. E.g. if your company name is ABC Land Co. Then build / buy a site for ABCLandCo . com so that when potential buyers or sellers Google you (and they sure will) they learn about you and the company - reputation building. Regularly I have conversations with potential sellers and buyers who have clearly been to my company site - they either tell me so or mention info that I know they got from the site. (example: "I see you are in the Houston area and your partner lives in the Waco area, I went to college in Waco, is that where your son went." - Now we spend 15 minutes talking about Waco, Baylor winning March Madness, Chip & Jo An. Eventually we get around to me buying his property for less than he wanted and him being okay with it.)