INNOVATE:Thanks so much for your valuable info.
The answer can be yes or no depending on your circumstances.
Yes if you are not considering a top end scholarship and for the reasons outlined by you.
Yes is also applicable if you are transferring from RI to HCI Humanities programme and aims to study in Oxbridge as a PSC scholar.
No from HCI to RI as much more difficult to land a top leadership position in RI vs-a-vs HCI as you are likely to be out voted by girls/guys from RGS/RI. HCI has shown to be more inclusive in this area.
Over the last ten years, only one student outside RI/RGS family(junior high) managed to win the President scholarship compared to 3 for HCI even though the latter produces less President scholars.
If you scrutinise carefully, there are a total of 8 President scholars that have emerged from non IP schools over the last ten years and none of them had studied in RI.