Dear Rishi ,,
Certifications do matter especially additional certifications which are relevant to your job and qualifications ...... The fact might be correct that ca's have become a norm in investment banking but that does not and does not at all mean that only chartered accountants have got investment banking knowledge .... CA inter will surely add weightage to your resume because there are many government job , even for company secretary that require or add an additional qualification of 'cwa/llb/ca' as an additional desirable qualification. You are considerabally right when you are saying that you are loosing out on good opportunities due to lack of additional qualifications.
A practical example is this advertisement of merchant/ i - banking recently by bank of india
https://corporate.indbankonline.com/Openings.pdf
wherein they have asked for additional nism/ncfm certifications. i have gone across many such advertisements where companies required additional degree in desirable field ..... However experience can really surpass a noveau qualified and multi qualified person , but if you have time resources and money , additional qualification is the best way .