First off this is for .org the spleef is great people setwarps, fun to play ect. But for advertising purposes (not illegal) 1k per year to have your [/warp up] at spawn ie. by the staff wall it'll say Spleef warps/warp spleef, /warp get, /warp bacon, /warp Mitch ect. (not too much). This is SO much FUN almost everybody likes it so people should know it (not enough know about lava spleef <--- true fact ).
ooooh okai, i dont think that would happen as then everyone will want their shop there. its sorta an unfair advantage.
Have a server-run spleef arena that uses the lava/obsidian set-up. A sign says at spawn "For a spleef arena click this sign --->" With a warp sign to a auto reseting spleef that starts every 10 minutes or so.
