I don't believe that the amount of paid-up capital makes any difference to the charges. The Company Secretary has a legal role to play in the administration side of the company, which has nothing to do with the amount of capital, revenue, profitability etc.
Well, this being Singapore, all want a 'sliding scale' of charges
The higher the paid up, the higher or slightly higher will the agency ask, as fees .. seen it .. but you can always negotiate ..
Oh, it is better to put maximum at the incorporation than wait it out and then put in, as there is some delay between the initial vs the amount to reflected in ROCS
Adding to what Ecurelix said about the types of pass available to you, as well as being determined by your qualifications, it is also dependant on the salary you will pay yourself and also your age. I think the figures have been recently updated and I don't have them to hand, but I think a P1 required a $7500 monthly salary a couple of years ago while a Q1 was around $3k for younger applicants, more for older ones.
New salary scales, as per the MOM link I posted..
P1 Employment Pass
Fixed monthly salary ≥ $8,000
Possesses acceptable qualifications
P2 Employment Pass
Fixed monthly salary ≥ $4,500
Possesses acceptable qualifications
Q1 Employment Pass
Young graduates from good institutions could qualify if they earn at least $3,000
Older applicants would have to command higher salaries to qualify, commensurate with the work experience and quality they are expected to bring
Note the words: Possesses acceptable qualifications
hence the disclaimer that declaring and paying yourself a higher pay doesn't guarantee an EP.
The only exception is if you incorporate a company, with atleast 6 Zeros ..in paid up capital ..