Some won't change from 4 to 8.
I've been going for 4 months now and in the first 3 months I offered 4 or 8 weekly at the same price.
Going from no job / work, to a business that leaves my family spending money in 4 months is great. I'm looking to get a van and be able to take on more work at the end of this year. Once I'm up to full capacity with the van I will look at moving as many 4's to 8's as I can.
At the moment I'm happy as its growing. My wife and I have done a lot of hard work, time for a break for a little while.
Someone not so long ago said something along the lines of..
You need to get rid of your first 200 customers to have a damm good business.
The first 200 are a learning curve... Some being underpriced, damm awkward or bad payers.
If I could do it all over again I would have offered a different price for 4 and 8 weekly, but you live and learn