Only invest in Bitcoin if you want to be part of the revolution building an alternative to the fiat debt slavery bankers cartel that owns your government. There is no guarantee of fiat denominated speculative gains - holding your hard earned savings in a currency free of parasitic rentseeking bankers should be enough. If being part of the Bitcoin P2P monetary revolution that treats all people equally without fear of favour while not imposing itself upon anyone is your motivation than you have already won.