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of course psychology plays a part, humans are playing, not just machines.

Blame the refs

I always go agro at the ref.

"The social atmosphere in the stadium leads referees into favoritism"

http://freakonomics.com/2011/12/18/football-freakonomics-how-advantageous-is-home-field-advantage-and-why/

Considered together, the results suggest that in sports with little or no spectator influence teams may win more often at home for reasons other than biased umpiring decisions, such as familiarity with their home ground or a visiting team's fatigue following travel.

https://www.ncbi.nlm.nih.gov/pubmed/11769890

I  think all of the above+ we don't know

Also this

Home bias is the tendency for investors to invest in a large amount of domestic equities, despite the purported benefits of diversifying into foreign equities. This bias is believed to have arisen as a result of the extra difficulties associated with investing in foreign equities, such as legal restrictions and additional transaction costs.

Investopedia http://www.investopedia.com/terms/h/homebias.asp#ixzz4WAdxG3uN

ahahah, not really

cheers