There are many advantages joint venturing with offline businesses. You could increase your target market by reaching audiences you couldn’t advertise to before. You could get referrals from the offline businesses you joint venture with.
The key to joint venturing with offline businesses is to find ones that have the same target audience. If you’re selling business software, you wouldn’t want to joint venture with a store that sells candy. You won’t be very successful. You would want to joint venture with an office supply or computer store.