How allotment actually works
SEBI mandates that in an oversubscribed retail category, each applicant gets at most 1 lot (maximum allotment to any single retail applicant). The allotment is by lottery — every valid application gets one lottery ticket regardless of how many lots were applied for.
This means: applying for 14 lots gives the same allotment probability as applying for 1 lot. The only difference is the blocked funds in your UPI mandate.
Exception: If the IPO is undersubscribed in retail (subscription below 1×), everyone who applied gets full allotment.
Applying to IPOs purely for listing gains is speculative. Many IPOs list below issue price. Historical data shows ~40% of IPOs list at a loss within 6 months. GMP (grey market premium) is unofficial and often manipulated.