. . . How bad is it to have that many? . . .
1) Don't know if there is a "too" many.
2) As long as you can manage the debt, or absence of it, you are fine.
3) We have (11) credit cards, but (3) are business related.
. . . (2) for our own LLC's
. . . (1) for personal and business air travel
4) We use the Delta-AMEX solely for air travel
. . . for the air miles
. . . for the preferred boarding (good for groups)
. . . for the free baggage check
. . . for other travel perks
5) We have one card we use for all personal buys so we get the rewards
. . . gas
. . . groceries
. . . utilitiy bills
. . . medical bills
. . . furniture
. . . golf
. . . haircuts
. . . and ANY purchase that takes plastic
6) We use one single card for the LLCs, to get the rewards
. . . goods
. . . services
. . . taxes
. . . etc
7) We usually gain (1) new card per year, solely for free interest
. . . the business sometimes has individual large expenses
. . . although we could pay in one month, budgeting over a year can be nice
. . . a slight advantage is having free interest and investing the other money
. . . once the free interest is done, we usually never use the card again
. . . then we get another free interest card for the next year