There may be an average for your particular niche, however I believe it varies drastically on the whole. Largely depending on the work you do, experience, and your contacts. Also, I believe the rate you charge gets you completely different clients. Charging $50 an hour? You will get people who don't pay, don't know what they are doing, and are hard to work with. Don't change anything except your rate (e.g. $150 an hour) and you will see completely different clients.
I personally work only off retainer at a rate of ~2k per day. I think for my line of work this is on the lower end. Retainer must be paid upfront. I have fewer, but longer lasting clients and projects. I am VERY good to them. I believe I approach the freelancing game different than most and it nets a lot of referrals. I often turn down work and I am a stickler on who/what I work on.
NOTE: 90% of the time I work for myself solo and 10% of the time I freelance, mostly out of the desire to get new perspectives and work with others.
I personally work only off retainer at a rate of ~2k per day. I think for my line of work this is on the lower end. Retainer must be paid upfront. I have fewer, but longer lasting clients and projects. I am VERY good to them. I believe I approach the freelancing game different than most and it nets a lot of referrals. I often turn down work and I am a stickler on who/what I work on.
NOTE: 90% of the time I work for myself solo and 10% of the time I freelance, mostly out of the desire to get new perspectives and work with others.