Rouge Hill is within the City of Toronto, not Pickering. That said, it's about 26km from Downtown, instead of 14km for Weston.I live in Weston, commute to downtown on the UP. Its overcrowded when running 2-car trainsets, and generally everyone can sit if they're running 3-car trainsets.
If you're leaving from the Weston station:
UPX: 14 minutes to Union, $5.02 per trip....~$220 per 40-trip month (every 15 minutes).
GO Transit: 19 minutes to Union, $4.76 per trip....~$169 per month PRESTO (2-4 times per hour)
TTC: 59 minutes to Union, (via Lawrence West station), $3.10 per trip....~$138 per month PRESTO
When the price went up in April from $169/month to $220/month, there were very few people who moved from the UP platform to the GO platform to commute, as the Kitchener trains are almost always standing room only in-bound at rush hour, and there is a much better chance of getting a seat going downtown on the UP, even if its a 2-car train. For comparison, no other GO Station within the City limits is more than ~$185/month for GO PRESTO, with those just outside the City boundaries, like Rouge Hill, at about $235.
I'd argue that a 30% premium on a monthly basis for commuters using UP over GO is already high enough. And that's still 18% higher than the outermost GO stations within the City limits (like Guildwood, Milliken or Long Branch).