Most of this is wrong and doesn’t look into the facts for the reasons already listed. So far this thread has focused on HQ and VG sites, which make good isk but Assault sites aren’t really done unless forced to and scout sites aren’t done at all even when VG fleets get light on people as there is just no isk
Incursion scout sites (3-5 people) need another revamp, last one was in 2014. As a result of lots of ECM and heavy tanked NPCs (but low dps) its very easy to tank them but trying to make any isk from them is hard.
Just went into a FRO (a scout site) to double check, 2 mara, 1 arnon, 1 jel as the first wave (data from http://games.chruker.dk/eve_online/npc_ships.php?supergroup=24 )
140 hp/s rep from the 1 mara, so trying to kill 1 mara requires 700 ehp/s applied. The mara also range tanks (orbits 60 km/s, 2km/s burn speed) and has a sig of 65m reducing the application
While this is happening the arnon is using ECM of 12.0, so the chance to jam someone in fleet and further reduce the fleets dps is high
The jel doesn’t do much but has a sig of 49m, velocity when orbiting of 560m/s at 11km and shield resists of 60% , so unless you have a lot of webs/paints or T3 cruisers it won’t die quickly, specially if the mara rep it.
I am aware that CCP want these as low isk and easy to run for newbros ect but they would be lucky to make 15 mill/hour with a lot more effort than belt ratting. HQ fleets ,40 people, 8-16 of which are snipers sometimes struggle to take out 2 maras if they are up to speed let alone a 5 man fleet that will need at least 1 person with short range guns to get the jel (or people using drones) and probably 1 person as logi or using marauder fleet it would still be a difficult to get the dps to break the mara reps
Best thing to do would make it so that a max ship size could get into the site then massively reduce the tank/change the types of rats used, would suggest frig with maybe 1 battleship (depending on what the maximum sized ship is this could be too much tank, yulai spawning at short range wouldn’t be too bad)