Your Sales team has to answer too many questions about your security strategy. You're faced with the decision of building your own InfoSec team. Have your Sales team spend more time selling and less time explaining technicalities to Customers.
Do you have compliance requirements from your Customers? Do you service an industry with regulatory requirements? Benefit from a strong cybersecurity program without the cost of building an InfoSec team.
If your organization is a new business establishing itself in the market, you absolutely need to have the mentoring of a CISOaaS to ensure that your products or your business practices don't develop lethal flaws before it's too late.
If your cybersecurity was compromised in the past, you certainly need to contain and mitigate breaches. Most importantly, you want to be better protected this time around.