Clear moulds

I got this brilliant but very expensive clear silicone and decided to make a ring mould- it's great because now I will be able to see exctly where things are as they are casted, so no uneven parts ever again! It's very bubbly though because of the thickness, but I don't have a vacuum machine to suck them all out. I might start selling these but they'd have to be around £8 each to be viable- do you think it's worth it?