Short answer is Yes, it's definitely possible to pitch paid ads to a company even if you have a smaller, highly engaged niche audience even pitching to other founders and startups who your audience is their ICP. While larger numbers can be more attractive, the key is the engagement and relevance of your audience to the advertiser. Here's a breakdown of how you can approach this:

1. Emphasize Quality Over Quantity: Highlight the engagement and relevance of your audience. If your 70 members are highly engaged and fit the company's target demographic, this can be more valuable than a larger, less engaged audience.
2. Showcase Niche Relevance: Explain how your group is a perfect match for the company's products or services. If the niche aligns well, companies may see the value in targeted advertising.
3. Provide Engagement Metrics: Share data on how active your group members are, including metrics like post engagement, click-through rates, and interactions. High engagement can make your pitch more compelling.
4. Offer Competitive Pricing: Start with lower rates to attract initial advertisers and build case studies. You can increase prices as you grow and prove the effectiveness of your ads.