Even though IHG insist that they reward top 1% Ambassador RA status. Maybe our assumption about 1% based on room night was wrong? There are two possibilities.

Scenario 1, contribution based on brand night

let us say, one IC night eq. 1 night contribution
one CP night eq. 0.8 night contribution
one HI/IN night eq. 0.7 night contribution
one HIS/SB eq. 0.5 night contribution
one CW eq. 0.3 night contribution

One AM stays 5 nights in IC (3 stays), 8 nights in CP (5 stays), 24 nights in HI (11 Stays), 18 nights (9 Stays) in HIX and 3 nights in others (2 stays). Thus total 58 nights qualifies RA.

However the total contribution value at 5 + 6.4 + 16.8 + 9 + (1) = 38 nights

This member completed 30 stays. The average contribution per stay is 1.93 and the mean contribution value is 1.27. The difference is 0.66 which will be used to analyse the 1% mark. The lower difference value it is, the closer to RA membership.


Scenario 2, based on base points

Still the same member, suppose:
average spending in each hotel brand ( room + inc.):

IC: USD$250
CP: USD$180
HI/IN: USD$140
HIX: USD$110
SB/CW: USD$100

So the base points can be calculated as:
6,000 + 14,400 + 33,600 + 19,800 + 1,500 = 75,300

Base points contribution qualifies for Plat. therefore member is invited for RA.

However, if the member always book the cheapest available room and did not spend any dollar in hotel. The picture would be:
IC: USD$230
CP: USD$108
HI/IN: USD$85
HIX: USD$75
SB/CW: USD$68

So the base points can be calculated as:
6000 + 8,640 + 20,400 + 13,500 + 1,020 = 49,560

10,440 points behind 60,000 points mark. Look at the average spending per night mark for this member now is USD$85.45. Member would not be qualified for RA based on base point, but it would be at IHG's decision whether the member meet the secret critirea (1% mark).


What point I want to make is, maybe IHG central marketing have their own way to calculate each member's contrbution based on nights/base point to evaluate RA 1% mark. The two scenario above is just "possibilities". IHG may have their own way to do it. However, if your base point (forget the platinum bonus and promotional points) on hotel stays is over 60,000 in one membership year, you should have very strong ground to be qualifying for RA.