C248 is a WH connection to null, that allow capital ships to jump through.
My suggestion is to let any (even C1) wormhole to have one. But only if you have Fortizar or Keepstar in your wormhole, fitted with new module. That module will consume rather large amount of fuel, but allow your fellow members to invade some random null sec system with capital ships.
+more life in wormhole
+more pressure on ratting bots in null
+more WH connections from null to … just anywhere.
-your hard earned null sec sweet little home is not as safe as before…