Even 10 billion CFU's is a tiny drop in the ocean of our gut bacteria which have trillions of bacteria.
You can make yoghurt out of lacto-'good' bacteria capsules or sachets I do this regularly and I make a lot sometimes enough for 1-2 pints a day. This should also be suitable for people intolerant to Lactose (the lactose - milk sugar is consumed by the bacteria). Dont forget normal yoghurt usually contains lacto acid bacteria and I'm not convinced that probiotic strains are any more beneficial than normal yoghurt strains (but I still use them)
There seems very little research on how many CFU's of bacteria are present in yoghurt but if I take say 1x10bilion CFU acidophiluos capsule and make 1 litre of yoghurt out of it I figure those bacteria have 24-48 hours on continuous feeding with a very large food supply so I would not be surprised if the number of bacteria when finished could be 1000x that of the original capsule and simply by the volume of yoghurt I can consume - say a pint a day I could see how that could 'touch' a large portion of the intestinal walls and have a much greater chance of colonisation...
The yoghurt can taste as nice as any commercial variety (or nicer IMHO) so it's easy to eat a lot plus you can use it in lots of foods - soups omlettes and while heating above 45degrees probably kills bacteria there seems some evidence that dead bacteria are also effective in helping UC.
To make the yoghurt simply boil the milk until it froths a lot stirring all the time milk burns easily - keep it frothing for 4 min then allow it to cool to 40 degrees (a thermomitor is very important) add your starter - this could be a VSL packet (makes upto 6 pints of yoghurt) or a probiotic capsule or any probiotic yoghurt - one yoghurt will make 6 pints no problem stir it in and then put in the oven (would have to be electric I think) at 40 degrees for 24-48 hours - place the thermomitor in the oven to watch the temperature - over 43 and the bacteria may die and less than 37 and the yoghurt will be slow to make. I have a mark on my oven now to indicate 40 degrees and it works great every time.
Sorry for the long post but this seems like a very cheap way to get loads of beneficial bacteria and hopefully will make a difference for some people out there - also see the 'specific carbohydrate diet - SCD' website/recipes this info is based from them though I found out it is possible to use probiotic sachets myself.
Finally to make the yoghurt taste nice add boiled/microwaved blueberries, cherries or something similar (I use frozen ones) - becareful of things with seeds in though and then add honey to sweeten it.