It's not hard, it's that most researchers just don't care. Most researchers have access to all papers they need through their universities, and if they don't, most papers are only an email away. Publishing in those journals for which you need to pay (which is only a minority) is paid for by grands or the university. How many people do you know who couldn't get their papers published <i>only</i> because they couldn't afford the journal charges?<p>The truth is that only a small (albeit vocal) minority cares about 'open science'. For most researchers, it just doesn't matter, and there is no incentive to pursue it. Actually having time to write papers worth publishing is more of an issue than those that do get published being accessible to people who, in all honesty, have no interested in them (i.e., the general public).<p>(it's quite interesting to note that (in my statistically undoubtedly non-representative experience) the demographic that advocates 'open access' the most is quite homogeneous - mostly PhD students with a new professor here and there. Maybe it's the cynical me, but I've been in the game long enough to see people I meet at conferences convert from being advocates for open access to not caring about it any more once they get some years of experience and realize it doesn't matter that much.)