Ive got a website which for the most part is a portfolio, there is another section of the site mysite.com/micro-site which ranks extremely well for it chosen term / topic, and brings in lots of traffic, but actually has little to do with the core business. It was really made as a piece of content - in the same way sites like this are - http://chrome.com/campaigns/rollit

For the main site i use 1 Google analytics profile and set of tags, for the micro site i have a completely different analytics profile and set of tags.

The main reason ive done this is because the traffic stats and insights for the micro site are essentially just noise, its nice to have the traffic but they dont help when reading analytics reports, so if they were combined my analytics reports would be a mess.

Is there any disadvantage / negatives of doing this ?