The IMSLP Journal is now a Google page rank 6 site which means, basically, that anything published in the Journal is liable to be ranked high on a Google search. It depends on various factors, e.g. the search terms used and how an article is constructed (I can help on that). But, on the whole, Journal articles will tend to show up within seconds on Google page 1, often right at the top.
Which means that if a forum member writes for the Journal their material will tend to get read. The Journal's linked to IMSLP's Twitter account - almost 4,000 high quality followers - which adds to the exposure.
Use it! Submission policy here.