When roommates want to rent from me is requiring each to make 3Xs the monthly rent asking too much?

[Kenneth Davis]

I have some how gotten by with renting to mostly individuals who earn 3Xs the monthly rent, but for roommate rental situations I have been requiring each individual to earn 3Xs the monthly rent. Is it asking too much when 3 or 4 roommates want to split the rent for this requirement? If one of the group of roommates does not earn 3Xs the rent I require a co-signor for that individual, so incase a roomamte leaves, I know there should not be a payment issue from my viewpoint with my requirement but sure feels like many applicants who want to do this, dont seem to grasp my viewpoint. How do others of you handle roommate situations. I do also require each to complete a seperate application along with seperate background and credit checks, for again the misfortune of one leaving the group. Am I being to cautious?