At OP:
I assume you're talking about being a franchisee rather than a franchisor. I've never been a franchisee, but know many who have. A few thoughts...
1. It's impossible to say whether being a franchisee is a good idea without knowing the business name, coverage in the locale you're thinking about, the numbers, restrictions (oh, the restrictions!), and the franchisor's marketing model (did I mention the restrictions?).
2. You probably know this, but "purchase" prices are based on popularity. Remember when a Krispy Kreme franchise in CA was going for $1 million plus documentation of major assets? lol
3. Don't dismiss the percentage you'll be paying on revenues. Sometimes, it's low. Sometimes, it's highway robbery. (Great if you're the franchisor, of course.) If it's the latter, you'll be regretting life.
Talk to a few franchisees. Not the guys that run the McDs and Taco Bells. A lot of those guys are locked into prime real estate. Talk to smaller guys - unless you're buying a McDs, and if so, you'll need several to bring in the bucks. If you can, speak with a few that blew out, too. Ask 'em what happened.