Ask HN: Can hosting reps be trusted when doing server upgrades?

We have a server that has only 2GB of RAM and being a bit slow. We thought upgrading RAM to 4GB will speed things up. So I emailed our account manager at hosting firm how much would upgrade cost - he said £150+VAT on-off fee. (2GB RAM UPgrade). It looked to much for me so I looked around how much it costs on different sites, and seen 4GB RAM upgrade for £175+VAT , I emailed back to him and said its really too much and that company X does it for Y.

He emailed in 5 minutes that he can bring down the price to £100+VAT . Are we being ripped off here? Why there is not standard pricing on this stuff?